/**
 * Copyright (C) 2013 DaiKit.com - daikit4gxt module (admin@daikit.com)
 *
 *         Project home : http://code.daikit.com/daikit4gxt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.daikit.daikit4gxt.client.editor;

import java.util.Stack;

import com.google.gwt.editor.client.EditorContext;
import com.google.gwt.editor.client.EditorDelegate;
import com.google.gwt.editor.client.EditorVisitor;
import com.google.gwt.editor.client.LeafValueEditor;


/**
 * Dk special flusher
 * 
 * @author tcaselli
 * @version $Revision$ Last modifier: $Author$ Last commit: $Date$
 */
public class DkFlusher extends EditorVisitor
{
	private final Stack<DkBeanEditorDelegate<?, ?>> delegateStack = new Stack<DkBeanEditorDelegate<?, ?>>();

	@Override
	public <Q> void endVisit(final EditorContext<Q> ctx)
	{
		DkBeanEditorDelegate<?, ?> delegate;
		if (ctx.getEditorDelegate() == null)
		{
			delegate = delegateStack.peek();
		}
		else
		{
			delegate = delegateStack.pop();
		}
		assert delegate != null;

		// Pull value from LeafValueEditors and update edited object
		final LeafValueEditor<Q> asLeaf = ctx.asLeafValueEditor();
		if (delegate.shouldFlush() && asLeaf != null && ctx.canSetInModel())
		{
			ctx.setInModel(asLeaf.getValue());
		}
	}

	@Override
	public <Q> boolean visit(final EditorContext<Q> ctx)
	{
		final EditorDelegate<Q> editorDelegate = ctx.getEditorDelegate();
		if (editorDelegate != null)
		{
			delegateStack.push((DkBeanEditorDelegate<?, ?>) editorDelegate);
		}
		return true;
	}
}
